Hello Nick,
Congrats on planning for your first house hack! I built my rental portfolio by house hacking, and later trading up to bigger properties. I recommend you take the following steps:
1. Find out the going rate for a bedroom rental in your area. Look at places like Facebook Market Place and Craigslist. If there is a range, I would use the lower end of that range to be safe. For example if bedrooms rent for $700 to $900 I would use $700/room to run my numbers.
2. Use a mortgage calculator (Zillow and Redfin have them built-in) on properties that you like using the down payment that you have planned for.
3. Then, see what you payments would look like after renting out a room or rooms to someone else. (In my market house hackers are paying a portion toward the mortgage, but it is less than what their rent is).
4. If the numbers make sense to you, then I would find a good loan officer and start the pre-approval process for a loan, and interview a realtor.
I hope this gets you off to a good start.
Cheers,
Melissa